The final two - go where you MAY be happier or go where you are most likely to get a job

Your kid is not a kid. You have an adult son.

A strong vote for Irvine

No school is going to make your child employable. Your son has to do that himself.
Those are statistics. None of those people are your son. It won’t have a better outcome if he’s miserable and does poorly.

I don’t see any reason to prefer one over the other based on statistics. This is your son’s first OF MANY big decisions that will affect the course of his life. There is little risk, and he needs to learn how to live with risk and make decisions. Let him make the decision and live with the consequences.

If the son makes the decision, then it’s on him if it does not work out. If you push SLO and he encounters college challenges (as many students do) he might claim “I didn’t really want to go there…”.